Autoimports' `typeFrom` property not used to generate declaration files

[8ctavio]

Environment

Nitro: 2.12.7
Node: v20.12.1

export default defineNitroConfig({
  srcDir: "server",
  compatibilityDate: "2025-10-21",
  imports: {
    imports: [
      {
        name: "foo",
        from: resolve(import.meta.dirname, "./pkg/src/index.js"),
        typeFrom: resolve(import.meta.dirname, "./pkg/dts/index.d.ts"),
      },
    ],
  },
});

Reproduction

Reproduction link

• Run pnpm prepare.
• Inspect .nitro/types/nitro-imports.d.ts.
• Look for a foo const; its type is string, but should be string | number | boolean (see pkg/dts/index.d.ts).

Describe the bug

Nitro does not use the typeFrom option of registered autoimports to generate declaration files, which may cause type declarations to not be found.

Nitro uses unimport's generateTypeDeclarations to generate declaration files' content, which supports the typeFrom option. However, a custom resolver that is missing typeFrom support is provided.

Additional context

• Nuxt had the same issue for app autoimports: fix(nuxt): support autoimports' typeFrom property when generating type templates nuxt/nuxt#33373.
• Generated exports with toExports should likewise use typeFrom if provided, but toExports does not currently support typeFrom. I submitted a PR to address this too.

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